Engine Control Module (ECM) - General Diagnostics and Tests: Other Volvo C30 I

CHECKING THE POWER SUPPLY AND GROUND TERMINAL

Power supply engine control module (ECM)

The engine control module (ECM) is powered via four power inputs on the control module.

When the ignition is on, all four power inputs are powered and the engine control module (ECM) is in active mode.

1. Power input 1, terminal #B54 (#C54) is supplied with power via a fuse from the battery. This power input is used to power the memory in the engine control module (ECM). In the event of an open-circuit, the engine control module (ECM) will be reset and adaptation values and diagnostic trouble codes (DTCs) will disappear
2. Power input 2, terminal #B30 (#C30) is supplied with power via a fuse from the start control module (SCU), ignition position II (KL15, "wake up"). This power input is used to activate the engine control module (ECM). When power input 2 is powered, the system relay will be activated and power inputs 3 and 4 will be powered. The engine control module (ECM) will not be activated if there is an open-circuit
3. Power input 3, terminal #B4 (#C4) is supplied with power via a fuse from the system relay. The system relay is activated by the engine control module (ECM). This power input governs the supply of power to the engine control module (ECM)
4. Power input 4, terminal #B6 (#C6) is supplied with power via a fuse from the system relay. The system relay is activated by the engine control module (ECM). This power input governs the supply of power to the engine control module (ECM).

Checking the power supply

Check the power supply cable from the battery to engine control module (ECM) terminal #B54 (#C54). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage.

Check the power supply cable from the start control module (SCU) to engine control module (ECM) terminal #B30 (#C30). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Check the power supply from the system relay to engine control module (ECM) terminals #B4 (#C4) and #B6 (#C6). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal engine control module (ECM)

The engine control module (ECM) has three ground inputs. All ground inputs from the control module are connected via three separate ground leads to the same ground terminal in the car body.

1. Ground input 1, terminal #B1 (#C1), is power ground and is connected to the ground terminal in the car body
2. Ground input 2, terminal #B2 (#C2), is power ground and is connected to the ground terminal in the car body
3. Ground input 3, terminal #B3 (#C3), is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal

Check the ground lead between engine control module (ECM) ground terminals #B1 (#C1), #B2 (#C2) and #B3 (#C3). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection for the engine control module (ECM) and the ground terminal must not be greater than 0.5 V.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-500251-S16432032892012091100000)
2. see «SIGNAL SPECIFICATION»(ref-500252-S08653660702012091100000)
3. see «CHECKING WIRING AND TERMINALS»(ref-500249-S05296466302012091100000)

Scheme 1

Power supply engine control module (ECM)

The engine control module (ECM) is powered via four power inputs on the control module.

When the ignition is on, all four power inputs are powered and the engine control module (ECM) is in active mode.

1. Power input 1, terminal #B54 (#C54) is supplied with power via a fuse from the battery. This power input is used to power the memory in the engine control module (ECM). In the event of an open-circuit, the engine control module (ECM) will be reset and adaptation values and diagnostic trouble codes (DTCs) will disappear
2. Power input 2, terminal #B30 (#C30) is supplied with power via a fuse from the start control module (SCU), ignition position II (KL15, "wake up"). This power input is used to activate the engine control module (ECM). When power input 2 is powered, the system relay will be activated and power inputs 3 and 4 will be powered. The engine control module (ECM) will not be activated if there is an open-circuit
3. Power input 3, terminal #B4 (#C4) is supplied with power via a fuse from the system relay. The system relay is activated by the engine control module (ECM). This power input governs the supply of power to the engine control module (ECM)
4. Power input 4, terminal #B6 (#C6) is supplied with power via a fuse from the system relay. The system relay is activated by the engine control module (ECM). This power input governs the supply of power to the engine control module (ECM).

Checking the power supply

Check the power supply cable from the battery to engine control module (ECM) terminal #B54 (#C54). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage.

Check the power supply cable from the start control module (SCU) to engine control module (ECM) terminal #B30 (#C30). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Check the power supply from the system relay to engine control module (ECM) terminals #B4 (#C4) and #B6 (#C6). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal engine control module (ECM)

The engine control module (ECM) has three ground inputs. All ground inputs from the control module are connected via three separate ground leads to the same ground terminal in the car body.

1. Ground input 1, terminal #B1 (#C1), is power ground and is connected to the ground terminal in the car body
2. Ground input 2, terminal #B2 (#C2), is power ground and is connected to the ground terminal in the car body
3. Ground input 3, terminal #B3 (#C3), is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal

Check the ground lead between engine control module (ECM) ground terminals #B1 (#C1), #B2 (#C2) and #B3 (#C3). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection for the engine control module (ECM) and the ground terminal must not be greater than 0.5 V.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-500251-S16432032892012091100000)
2. see «SIGNAL SPECIFICATION»(ref-500252-S40520643792012091100000)
3. see «CHECKING WIRING AND TERMINALS»(ref-500249-S05296466302012091100000)

CHECKING THE POWER SUPPLY AND GROUND TERMINALS

Power supply engine control module (ECM)

The engine control module (ECM) is powered via four power inputs on the control module.

When the ignition is on, all four power inputs are powered and the engine control module (ECM) is in active mode.

1. Power input 1, terminal #B54 (#C54) is supplied with power via a fuse from the battery. This power input is used to power the memory in the engine control module (ECM). In the event of an open-circuit, the engine control module (ECM) will be reset and adaptation values and diagnostic trouble codes (DTCs) will disappear
2. Power input 2, terminal #B30 (#C30) is supplied with power via a fuse from the start control module (SCU), ignition position II (KL15, "wake up"). This power input is used to activate the engine control module (ECM). When power input 2 is powered, the system relay will be activated and power inputs 3 and 4 will be powered. The engine control module (ECM) will not be activated if there is an open-circuit
3. Power input 3, terminal #B4 (#C4) is supplied with power via a fuse from the system relay. The system relay is activated by the engine control module (ECM). This power input governs the supply of power to the engine control module (ECM)
4. Power input 4, terminal #B6 (#C6) is supplied with power via a fuse from the system relay. The system relay is activated by the engine control module (ECM). This power input governs the supply of power to the engine control module (ECM).

Checking the power supply

Check the power supply cable from the battery to engine control module (ECM) terminal #B54 (#C54). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage.

Check the power supply cable from the start control module (SCU) to engine control module (ECM) terminal #B30 (#C30). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Check the power supply from the system relay to engine control module (ECM) terminals #B4 (#C4) and #B6 (#C6). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. Check the fuse. The voltage must be approximately battery voltage when the ignition is on.

Ground terminal engine control module (ECM)

The engine control module (ECM) has three ground inputs. All ground inputs from the control module are connected via three separate ground leads to the same ground terminal in the car body.

1. Ground input terminal 1, #B1 (#C1), is power ground and is connected to the ground terminal in the car body
2. Ground input terminal 2, #B2 (#C2), is power ground and is connected to the ground terminal in the car body
3. Ground input terminal 3, #B3 (#C3), is power ground and is connected to the ground terminal in the car body.

Checking the ground terminal

Check the ground lead between engine control module (ECM) ground terminals #B1 (#C1), #B2 (#C2) and #B3 (#C3). Check for an open-circuit. Check for loose connections. Check for contact resistance. Check for oxidation. With the ignition on, the drop in voltage between the ground connection for the engine control module (ECM) and the ground terminal must not be greater than 0.5 V.

Remedy as necessary.

Other information

1. see «CONNECTING THE BREAKOUT BOX»(ref-500251-S16432032892012091100000)
2. see «SIGNAL SPECIFICATION»(ref-500252-S36983929532012091100000)
3. see «CONTENTS»(ref-500249-S15428429872012091100000)

CONNECTING THE BREAKOUT BOX

Special tools

see 9512902

see 9989778

see 9511428

see 9511499

HINT: The breakout box is designed to facilitate reading off the control module input and output signals when the control module is connected and cable and component resistance when the control module is disconnected. The use of a breakout box reduces the risk of accidental short-circuits and damage to the connector pins.

DISCONNECTING THE CONTROL MODULE

1. Wait 3 minutes after switching off the ignition before disconnecting the connectors from the engine control module (ECM). The system relay must be voltage free before the control module can be removed from the vehicle. If the engine cooling fan (FC) runs on after the ignition has been switched off, wait until it stops and then wait for a further 3 minutes
2. Remove the engine control module (ECM). See «ENGINE CONTROL MODULE (ECM)»(ref-500254-S29252945662012091100000)
3. Install cover plate see «9989778»(ref-460875-S35523729082012033000000) over the hole for the engine control module (ECM).

Note. Ensure that the cover plate is properly sealed

CONNECTING THE ADAPTER

1. Check that no pins or sockets are damaged on the connectors
2. Check that the male and female terminals on the engine control module (ECM) are undamaged and secure (cannot be pressed in). Check that the cables to the female terminals are secured to the terminal pins
3. Carefully install the vehicle cable harness on see «9512902»(ref-460875-S37351866312012033000000) . Lock the connectors in position by pressing in the catches fully.

CONNECTING THE BREAKOUT BOX AND THE ENGINE CONTROL MODULE (ECM)

1. Connect the breakout box see «9511428»(ref-460875-S19859279082012033000000) to the adapter via wiring see «9511499»(ref-460875-S42703648442012033000000)
2. Carefully install the adapter on the engine control module (ECM). Lock the adapter in position by pressing in the catches fully.

REMOVING THE ADAPTER AND CONNECTORS

1. Wait 3 minutes after the ignition has been switched off. The main relay must be voltage free before the control module can be removed from the vehicle. If the engine cooling fan (FC) runs on after the ignition has been switched off, wait until it stops and then wait for a further 3 minutes NOTE: Do not touch the engine control module (ECM) terminal pins with your fingers. Static electricity may damage components in the engine control module (ECM).
2. Carefully disconnect the engine control module (ECM) from the adapter cable harness
3. Carefully disconnect the adapter from the vehicle cable harness
4. Remove the cover.

CONNECTING THE CONTROL MODULE

1. Check that no pins or sockets are damaged on the connector
2. Install the engine control module (ECM). See «ENGINE CONTROL MODULE (ECM)»(ref-500254-S29252945662012091100000)

MEASURING THE ETHANOL CONTENT

The method works for gasoline-ethanol fuel.

Note. First read the safety instructions for handling fuel.

Drain the fuel carefully from the vehicle.

Note. The fuel should be drained from the fuel distribution pipe and not from the fuel filling pipe/tank.

Scheme 2

Mix equal parts of fuel and water in a graduated, transparent container. Let stand for at least 5 minutes. The ethanol dissolves in the water and the mixture separates into layers. Gasoline is the lightest and ends up at the top.

Read off the number of graduation steps of gasoline and compare to the number of graduation steps of fuel that has been added. Best accuracy is achieved with a long-narrow measuring glass. Suitable design of version measuring glass is total volume of 500 ml with markings for every 5 ml, or total volume of 1, 000 ml with markings for every 10 ml.

Example: Mix 500 ml fuel with approx. equal parts water. After the ethanol has dissolved we can assume that the measured amount of gasoline is 120 ml.

Gasoline content is then calculated to: 120 ml/500 ml = 0.24 = 24%

This, ethanol content is: 100%-24% = 76%

HINT: When the ethanol dissolves in the water the fluids' total volume is reduced. To facilitate read-off you can fill the container with more water. Note that this does not affect the calculations above, since this takes place in relation to the amount of added fuel.